Following up another topic as a result of one of Carlos Alvarado's posts on his Parapsychology Blog I ran into this.

Apparently in the TV series Northern Irelandís Greatest Haunts season 2 episode 1 while a Medium was getting information in one room in another a psychic investigator was recording both parts of the conversation that of the Spirit and the medium.

He has now published a book on this Spirit Voices - The First Live Conversation Between Worlds http://www.anomalistbooks.com/book.cfm?id=42